1011200111021 has 4 divisors (see below), whose sum is σ = 1014390017052. Its totient is φ = 1008010204992.

The previous prime is 1011200111017. The next prime is 1011200111099. The reversal of 1011200111021 is 1201110021101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43790166121 + 967409944900 = 209261^2 + 983570^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011200111021 - 2² = 1011200111017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011200110993 and 1011200111011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011200111321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1594952540 + ... + 1594953173.

It is an arithmetic number, because the mean of its divisors is an integer number (253597504263).

Almost surely, 2^{1011200111021} is an apocalyptic number.

It is an amenable number.

1011200111021 is a deficient number, since it is larger than the sum of its proper divisors (3189906031).

1011200111021 is an equidigital number, since it uses as much as digits as its factorization.

1011200111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3189906030.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1011200111021 its reverse (1201110021101), we get a palindrome (2212310132122).

The spelling of 1011200111021 in words is "one trillion, eleven billion, two hundred million, one hundred eleven thousand, twenty-one".